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Determining equipment condition.........................................................

Reasons for inspections and tests .........................................................

Associated test guidance and records......................................................

Section II-REQUIREMENTS

Electric workers, instruments, and reports

Frequencyofinspection..................................................................

Chapter 3. TRANSMISSION AND DISTRIBUTION SUBSTATIONS Section I-GOVERNING CONSIDERATIONS

Typeofsubstationscovered...............................................................

Electrical system relationships............................................................

Substation safety concern................................................................

Substation security......................................................................

Periodic inspections of substations ........................................................

Visual inspections of substations..........................................................

Infrared inspections of substations ........................................................

Section II-STRUCTURE MAINTENANCE

Importance of maintenance..............................................................

Galvanized steel structure...............................................................

Painted steel structures..................................................................

Aluminumstructures....................................................................

Wood structures.........................................................................

Concrete for structure foundations ........................................................

Structure connections and joints ..........................................................

Section III-SUBSTATION YARDS

Provisionofyards........................................................................

Fences for yards.........................................................................

Warningsignsatyards ...................................................................

Substation yards.........................................................................

1-1

L-l

1-2

L-l

1-3 ]

l-l

1-4 ]

l-l

1-5

L-l

1-6 1

1-2

1-7

L-2

1-8

L-3

1-9

L-3

1-10

L-3

1-11

L-3

1-12

L-3

1-13

L-3

1-14

1-4

1-15

L-4

1-16

L-4

2-1 :

2-1

2-2 :

2-1

2-3 :

2-1

2-4 :

2-2

2-5

2-2

3-1

3-1

3-2

3-1

3-3

3-1

3-4

3-1

3-5

3-1

3-6

3-1

3-7

3-1

3-8

3-2

3-9

3-2

3-10

3-3

3-11

3-3

3-12

3-3

3-13

3-3

3-14

3-3

3-15

3-3

3-16

3-3

3-17

3-3

3-18

3-3

This manual supersedes TM 5-684/NAVFAC MO-200/AFM 91-3, dated 20 April 1979

TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

Paragraph Page

Section IV-INSULATORS

Function of insulators....................................................................

Testsofinsulators .......................................................................

Inspection and repair of insulators ........................................................

Cleaningofinsulators....................................................................

Section V-BUS STRUCTURES

Definitionofbus structures...............................................................

Maintenance of bus structures............................................................

Cleaningofbus structures................................................................

Testingofbus structures ..................................................................

Section VI-INSTRUMENT TRANSFORMERS

Definitions of instrument transformers ....................................................

Short-circuiting dangers..................................................................

Maintenanceofinstrumenttransformers..................................................

Tests of instrument transformers..........................................................

Section VII-BUSHINGS

Definition of bushing....................................................................

Type of bushings covered.................................................................

Maintenanceofbushings .................................................................

Bushingpowerfactortests ...............................................................

Bushing insulation resistance test.........................................................

Chapter 4.

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